King's Coin

A King's Coin, known as a Conqueror's Coin (覇者のコイン Hasha no Koin) in the Japanese version, is a coin in the Yu-Gi-Oh! ZEXAL anime used by Kazuma Tsukumo to mark his presence at each set of ruins he had explored, totaling twenty-three ruins.[1]

According to Kite Tenjo, the coins were made with Astralite. He believes that Kazuma Tsukumo left these seven coins in the ruins so that Yuma could travel to the Astral World if there was ever a need for that.[8]